Underreamer.



qho'ronoo.

nir onnion' NDEIHCBE AMER.

` Epecicnlon of Letters laftent.

Rill-onion Nov. 11, 192t3 Applicallon ined .Tune 19, 1911. Serin No. 33,911.

,To oil 'zo/mm. 'I only oon/'fwn Be it linown lhzii' l, illumini lV. WILSON,

.n oiizizen of thollnited Stains, residing nl Los ngeles, in the county of Los Angolos and Stale of Cnlisl'orning hnve invenloil now anni useful Improvements in lhnlerronmers, oi which lho following is n speoiicntioin This invenl-ion rehiten to n1nleirenn1ers, snoh :is nro onnlolnnrily oniployed for renin ing wel! holes or hoi-ings hein-ruth the cnsing, prior lo loweringl of the hittor; nml it has for ils object lo provide certain improved ilenlniros novel with rohllion lo nononihhxge, orinnlion, oonstrnolhm, rehilivo arrangenon n-nil ooinhinnilnn lill oi? which will he snporior in point ol rehilivo simplicity .in d. inoxponsivenons of oonnlifnvl'ion :intl oi'gnin notion, posileivenoss of onmnlioxn ollieienoy in Service, i'ncililf'vv of control, :unl (lnrnhilily nnil longlh of lii'og nml whhyh will hn gein ornlly superior in, point' of ncrvioenhil-ily.

llilh the above anni other ohjeols in viewj the invention oonssls in tho novol provi-` Sion, construction unil orgnninnlion, in parlo nml with iro/spoold lo their total zinfsonn hinge, :ill :n: liei'oiiinfler ilosorihoel, shown in lho (l owing, :ind finally pointed ont in chiiins.

in [he lliowingt-llignro l in n nido eloH vnlion, partly lnfolien owny, of :in nnihirn ronniei oonslrnctell und org-minori in nceoi'ih nnen with ihn invention; Fig. 52 in n :lling inoninni7 sido elevation o'l" n portion oil 'he sznne, token :it right :ingles lo izho lino or vision in llig. l. lfifj'. un outer hice viow olf n entier or oil oi which ln'o' nre Shown in Fig. l, the sonne being` in ilelni'll'ioil position; Lil. is n section on they lino hnl, Fig. '1., looking; in lhe ilirooiion olf tho nppenileil ni'rown; nini, lig. iszi, Section on lholino 5-5, Fig. l, looking in the direc-lion oi' the npponllecl nrrown.

Correspoinling parlo in :ill lho figurer; nre Llonoleil hy the saine i'e'liei'enffo ulmrnolers.

lll1'i.'i11;` wilh pnrlionlnrily to the ilrowing, A designates lho holly or saloni oi un miller-rennier contrnclell lo olnhmly they invoniioin lhe sanno boing' provided with onlliern or hilo a disposnd znljneent lo the loner end pol-lion ol lhe stein or body A, and Willi n, projoclng working ininihei l5 depending ii'oin the lower onli ol lhe nloni or holly A. :1nd ilinponeil nl; ils upper end pol'lion he- Ln'oen lhe onlloin or hits o. The hits :ire monnl'ed lo Slide longg'ihnlin:illj,Y ol the Slain inlo :incl ont oi? positions of operative projoolion, nnfl tension moons C nro provided for posiiiively moving tho suino into positions ol' operative projection; said tension moons being mounted upon or cnrriol by ihn stein A. i

ln tho forni of ooni'si'rnctionand arr-ingenicnt ol paris selected for spooio disclosure in tho drawing', the stom or body A is provifloll nt its lovvor end portion with on in hn'nnl choinhero opening outwardly. at opposuill sides of tho stem, as at 6, and nt 'tho bottom of the stom, Suid chamber 6 being closed at tho top excepting for oonnnnnicnlion with opposed grooves or channels 7, :it opposite fno-es of the stem, which ohnnnels 7 open upwardly lhrongh n (lnninislieclpol`- tion 7 o'l the stern, und open downwardly into tho lateral Portions of the ohnxnher Y guidon 8 eonlning earch hilernl oriliee of the clnix'nhoi' (i, and ranging verlicnlly in parallelism :is to noch pair.4

'lhe dovohlil guides 8 terminate ntl their lower ends above and between, transverse pl'ionlcleis E) extendingnt right angles to ho pinne of he guides F3; the Walls of the ehninhei' G lmnonlh the shoulders0,a1idlotor- :illy of oneh lateral opening of Suid. chamber, boing formell into Spnood inclined faces 10, nt the respectivo siihs of euch lateral orifice of the chzunher (3, @zich oi sniol pairs o'l faces 1U nini-ging :it its lower odge portion into ninnhir spaced inclined lunes il, thel inolinntion-olf which is, as in lhnt of the lncenl l0, toward the longitnclinnl nxis, of lho stein A, lhe inolilmtion of ihn fnoes ll boing oxtronlelv in excess of lhnl; of the farces 10. Thol hives l1 merge into the i'nojeoting ivorhingl inonlhei ll, which is provided with n` :shank 1Q oxloniling upwardly wilhin the `chninlnrr (5 und minlinllly nnhnlviding tho sanne in n plano Linnsvorno of the `chamber 3 unil parallel with ihoso oi the guides 8. 'iho olnnnber G therefore divided into two pnr'tm no clearly shown, vertically of oooh of whivh ports extends o pair of the dovehi] gudes; und euch of tho bits a is provided with n shank 13 having dovoinil longues 1l iiling the dovolnil guides 8 to hohl said shank in position for nlovenioni within tho ohznnhoi Confined hy the ifepootivo puh' ol guides 8.`

llinfh hill o is formed with n working hond 15 nl. the lon'orond oil? the shank 123,` the suine lining providod nt ilI top'ivith lateral plone 'l'nceo lh 'litingthe shouhlorn 9 upon the :sonni or liolly, and with inclined Interni 011 9j pees-ace inner `faces 1'?" fitting the inclined 'faces l0 upon the stein or body. The main portion of the sliank 13 lits the respective opening between the respective guides 8, being provided near the opper end with an inclined shoulder 13a. The lower outer edge por. tion 18 of the bead 15 constitutes the cut tingl edge of the bit. Each bit shank 13 is pinned at its upper end, as at 19, to the lower end of a separate link arm 2O which is' accommodated in the respective channel '7, the said link arms extending upwardly and connected at their upper ends Witli e collar 21 slidable upon the stein A, above the tapering,i portion 7a, a coil spring 22 being disposed between the. tapering portion 7 and tbe collar 21, and normally holding the bits in elevated and laterally projected positions, or Working posit-ions, with the faces 153 .of the bits in engagement with tbe shoulders 9 upon tbe vsteni A.. Tiieprojecting Working member B, beneath the slianli; 12., which shown is disposed between the bits e, which are slidably mounted either side ot tbe shank, is formed and organized in any preferred manner, as for connection with string of boring or cutting tools, for de veloping the Well boring or cutting beneath the under-reanier.- A connection bead is shown beneath the elia-nir 1,2, but ang.r device or Working part, or any ineens for suspending and holding ang( device or Working part, beneath the s ein falls within the spirit of the invention. The upper end ci shank 12 is integrally or irmly connected with the stem A at the upper portion the chamber 6, and downwardly tapering blocks 24 are pinned to tbe upper end ci the shank 12, at tbe upper portion oi? the chamber (i, as at against which bioclzsl the upper ends of tiie siianls 13 bear' at their inner faces. These blocks 24 serve to bold the upper ends of the sbanl-,s witb the tongues 1-1 bearing against tlie guides 8, when the bits are in elevated and working I positions, as shown vin Fig. 1.

The operation, 'method i use and advantages of the improved under-reamers constituting the invention will be readily- Linden stood from the foregoing description taken in connection with ytbe accompanying drawing' and the :following statement :-'l`lie gcneral type of apparatus under treatment being Well nndcrstoodeiifitb respect to its operation, it is onlyv necessary to remark general that bollore introduction of the nnder-reainer within tbe Well casing the bits a are forced downwardlyand inwardly 'fromVv the working positions of the saine shown in the drawing, against the tension :of the spring 22 of the tension means C, until the faces 1T have passedbeneatli tbe inclined farces lOnpon. the stern, and tbe beads 15 of theJ bits are brought into 'with the shank 12 of the member B and Witii tbe 'cutting tool or, boring tool or die like,

edges at the tops of tlie lateral or inner faces` 17 in engagement with tbe sharply inclined faces 11 upon, the. stem. The bits ar tlien in retracted positions. The upper ends of the Shanks 13 are permitted to swing upon tbe pinned connecgions 19 with the linl arms 2t", as tbe bit beads 15 are brought inwardly toward the shank 12 over the sharply inclined faces 1i, suoli swinging action taking place when the upper ends of tbe Shanks 13 have reached trie inwardly tapering lower ends ot t'ne blocks The bits tiros swing "upon axes at their upper ends,y and this swinging action is most responsive to the conditions obtaining when the ascent of the d nnderereainer is begun. ifi/*ben tlie` bits swine' upon axes at their lower ends, driliings oecorne pocketed between them and the stem, preventing nniieiiing and complete re traction. Elie swinging at tbe opper ends obviates all. possibility of any jamming of the bits beneath tbe casing, and the bloei;g ing` of the bits by driilings or any other foreign substance entirely prevented.. When the onder-reame? is iowered to such position in tlie cat ng tbe bits bave passed beneath tbe shoe ci? tbe casing, the bits freed and permitted to l[nove outl wai-diy and upwardly, under tbe tension oi' the spring 22, into tbe positions shown in tbe drawing, with the faces 16 of the bits in engagement with tbe shoulders 9 open the stem, and the faces 1T of the bits in enkejzfiggenient with the inciined faces l() upon ne stein. The cutting edges 18 are nonl Yin positions for service, and; die rinden :einer operated in the usual manner lnongli tbe stein A and the string above it. n tbe retraction. of tbe bits the more .iarpiy inclined 11 facilitate tbe final retractive movement, and also provide a useful degree of opposition to the tendency oi die spring' to proiect the bits. it the saine time, the proiecting Worlcilnh inernber l., organized es may; be desired, with a is utilized to perform its service beneath tbe bits ofthenndenreainer, so that the cutting or boring mai; be developed at tbe saine time that tbe under-resining operation takes place.

Villien tbe ander-reame? is to be Witbdrawn from its position beneatli tbe casing', it `ie elevated in tbe usual manner, and tbe struction, formation, relative arrangement and combination of parts, members and feteV tures shown and described; but reserve the 1. An under-reamer comprising e. body provided et its lower end with a, chamber. and with a downwardly projecting toolbar rying shank extending vertically throughout said chamber, seid body having opposed feces each of which rcomprises anupperportion slightly inclined towardthe shank and nlower portion increasedlyV inclined towerd the shank, and bits mounted to traverse the I respective opposed faces each with' an' inner face in contact therewith; seid bits having Shanks disposed in seid chamber; and means -pivotally suspending the bits at the upper ends of the shanks.

V2. An underreamer vcomprising e body provided at its lower end with a chamber, said body beings| provided et the lower end of said chamber with two sets of feces et each side, each of said sets of feces having;

relatively inclined upper and lower portions,

bits mounted within said chamber to move pivotellyvtherein and being confined in seid chamber to such movement, seid bits co- `acting each with two sets of said relatively inclined faces at one side of said chamber, means pivotally ,suspegding the bits for movement within the cv amber, and a tool-V carrying'shank spanning the chamber and ranging throughout the seme vertically between the two sets of inclined feces and the co-ecting bit at one side of the chamber and the corresponding sets of inclined feces nnd bit et the other side of the chamber; the means of pivotal suspension of seid bits be ing. et the respective sides of thc upper end of said shanknnd clear thereof.

3. An underrearner comprising n body provided Ant its lower end with e chamber, said body being provided nt the lower end of seid chamber with two sets of feces et cach side, each of seid sets of feces hevinp,r relatively inclined upper and lower porti'ns, bits mounted within snidchnmber to move pivotnlly therein and being' coniined in 'seid chamber to such movement, said bits ceneting each with two sets of said relatively inclined faces et onefside of said chamber, Ineens pivotnlly suspending the bits for movement within the chamber, and n toolcarrying shank spanning the chamber and ranging throughout the seine vertically between the two sets of inclined faces and the meeting bit et one side of the chamber und Athe corresponding sets of inclined feces end bit et the other side of. the chamber; the ineens of pivotal suspension of seid bits being et the respective sides of the upper end of said shank and clear thereof; and downwardly tnicring' blocks disposed at the respective sides of the upper end oi the shank und with which the bits contact et their n pper ends. l

In testimony whereof, I lieve signed my naine to this specification in the presence of two subscribingf witnesses.

VVILLAM lV. lVILSON'. i/Vitnesses RA ricono l. Bm mzsmin, CHARLES D. lVAnonN.

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